#7 Make 'response' objects in messages more automatic

{
...
'response': {'response_code': 200,
             'response_description': 'OK',
             'request_id': '1234abcd'}
...
}

Including this section in each message seems redundant and we should be able to automatically fill this based on the context: ``` { ... 'response': {'response_code': 200, 'response_description': 'OK', 'request_id': '1234abcd'} ... } ```